Assessment Comments
Assessment based on 2001 biocriteria data: Fish IBI= 68 (good), BM-IBI= 77 (excellent).
Basis for Assessment
[Note: For the 2002 report, the previous waterbody segment IA 02-CED-0540-0, which extended 12 miles from the mouth of Deer Creek to an unnamed tributary in Worth County, was split into two subsegments: (1) mouth to the Mitchell-Worth county line. (IA 02-CED-0540-1) and (2) Mitchell-Worth county line to confluence with an unnamed tributary at east line of S28, T100N, R19W, Worth Co. (IA 02-CED-0540-2). See assessment information above for previous Section 305(b) assessments for the previous 12-mile stream segment.]
The assessment was based on data collected in 2001 as part of the DNR/UHL stream biocriteria project. The 2001 Fish IBI score was 68 (good) and the BM-IBI score was 77 (excellent). The aquatic life use support was assessed as fully supporting/threatened (=FST), based on a comparison of the F-IBI and BM-IBI scores with biological assessment criteria established specifically for the 2002 Section 305(b) report. The biological assessment criteria were determined from a statistical analysis of data collected at stream ecoregion reference sites from 1994-2001.
